Dr. Neal Barnard is an American physician, author, and clinical researcher known for his work in nutrition and health. He is the founder of the Physicians Committee for Responsible Medicine, an organization that promotes plant-based diets and ethical research practices. His research focuses on the effects of diet on chronic diseases, including diabetes and heart disease. In addition to his medical practice, Dr. Barnard has written several books on nutrition and health, advocating for a vegan lifestyle. He frequently speaks at conferences and appears in media to educate the public about the benefits of plant-based eating and its impact on overall health and well-being.